feat: UI全面改造 + 后端多项修复

【后端修复】
- 删除diet/consultation agent假工具声明
- 修复DayOfWeek实体注释
- 修复Vision API content序列化
- cleanup_service级联删除修复
- 用药提醒时区偏差修复
- 统一DateTime处理(UtcNow+8)
- 新增UTC DateTime JSON转换器

【前端UI重构】
- 配色体系全面更新(#8B5CF6淡紫+#F0ECFF背景)
- 登录页重设计
- 首页重设计(透明顶栏、渐变背景、胶囊输入区)
- 聊天卡片加白蓝边框、渐变标题
- 侧边栏重构(渐变背景、合并顶部、删除底部设置)
- 确认卡片可编辑字段恢复
- 所有子页面加返回按钮
- catch异常加日志
- 删除后refresh provider缓存

health_app/lib/pages/diet/diet_capture_page.dart

@@ -5,6 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:image_picker/image_picker.dart';
 import '../../core/navigation_provider.dart';
+import '../../core/app_colors.dart';
 import '../../core/app_theme.dart';
 import '../../providers/auth_provider.dart';
 import '../../utils/sse_handler.dart';
@@ -123,7 +124,9 @@ class DietNotifier extends Notifier<DietState> {
           if (text.isNotEmpty) state = state.copyWith(commentary: text.trim());
         }
       }
-    } catch (_) {}
+    } catch (e) {
+      debugPrint('[Diet] 获取饮食点评失败: $e');
+    }
   }
 
   List<FoodItem> _parseFoodItems(String raw) {
@@ -243,7 +246,7 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
         centerTitle: true,
       ),
       body: state.imagePath == null
-          ? const Center(child: Text('请从首页拍摄或选择食物照片', style: TextStyle(color: Color(0xFF999999))))
+          ? const Center(child: Text('请从首页拍摄或选择食物照片', style: TextStyle(color: AppColors.textSecondary)))
           : _buildResultView(context, ref),
     );
   }
@@ -263,11 +266,12 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
     final totalCalories = state.foods.where((f) => f.selected).fold(0, (sum, f) => sum + f.calories);
 
     return Container(
-      color: _kPageBg,
+      color: AppColors.background,
       child: SingleChildScrollView(
+        padding: const EdgeInsets.all(16),
         child: Column(children: [
           _buildImagePreview(state.imagePath!),
-          const SizedBox(height: 20),
+          const SizedBox(height: 16),
           _buildMealSelector(ref),
           const SizedBox(height: 16),
           if (state.isAnalyzing)
@@ -282,8 +286,8 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
                 _buildAiCommentary(state.commentary!),
               ],
             ],
-            const SizedBox(height: 24),
-            _buildSubmitButton(context, ref),
+            const SizedBox(height: 20),
+            _buildSubmitButton(),
             const SizedBox(height: 16),
           ],
         ]),
@@ -293,29 +297,25 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
 
   // ─────────── 图片预览 ───────────
   Widget _buildImagePreview(String path) {
-    return Stack(
-      children: [
-        Container(
-          height: 220,
+    return Center(
+      child: ClipRRect(
+        borderRadius: BorderRadius.circular(20),
+        child: Container(
+          height: 200,
+          width: MediaQuery.of(context).size.width * 0.75,
           decoration: BoxDecoration(
-            color: const Color(0xFFE0E0E0),
             image: DecorationImage(image: FileImage(File(path)), fit: BoxFit.cover),
+            boxShadow: [BoxShadow(color: Colors.black26, blurRadius: 14, offset: const Offset(0, 4))],
           ),
-        ),
-        Positioned(
-          left: 0, right: 0, bottom: 0,
-          child: Container(
-            height: 60,
-            decoration: const BoxDecoration(
-              gradient: LinearGradient(
-                colors: [Colors.transparent, Color(0x40000000)],
-                begin: Alignment.topCenter,
-                end: Alignment.bottomCenter,
-              ),
+          foregroundDecoration: const BoxDecoration(
+            gradient: LinearGradient(
+              colors: [Colors.transparent, Colors.black38],
+              begin: Alignment.topCenter,
+              end: Alignment.bottomCenter,
             ),
           ),
         ),
-      ],
+      ),
     );
   }
 
@@ -351,9 +351,9 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
                         : null,
                   ),
                   child: Column(mainAxisSize: MainAxisSize.min, children: [
-                    Icon(m.icon, size: 23, color: isSelected ? Colors.white : _kSubText),
+                    Icon(m.icon, size: 23, color: isSelected ? AppColors.textOnGradient : _kSubText),
                     const SizedBox(height: 4),
-                    Text(m.label, style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: isSelected ? Colors.white : _kSubText)),
+                    Text(m.label, style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: isSelected ? AppColors.textOnGradient : _kSubText)),
                   ]),
                 ),
               ),
@@ -416,7 +416,7 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
               const Spacer(),
               Container(
                 padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
-                decoration: BoxDecoration(color: const Color(0xFFFFF8EE), borderRadius: BorderRadius.circular(8)),
+                decoration: BoxDecoration(color: AppColors.warningLight, borderRadius: BorderRadius.circular(8)),
                 child: Text('共 $totalCal kcal', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: _kWarning)),
               ),
               IconButton(
@@ -441,9 +441,9 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
       child: AnimatedContainer(
         duration: const Duration(milliseconds: 200),
         decoration: BoxDecoration(
-          color: food.selected ? const Color(0xFFF6F4FF) : const Color(0xFFFAFAFA),
-          borderRadius: BorderRadius.circular(12),
-          border: Border.all(color: food.selected ? _kPrimary.withAlpha(30) : const Color(0xFFEEEEEE)),
+          color: food.selected ? AppColors.iconBg : AppColors.background,
+          borderRadius: BorderRadius.circular(AppTheme.rMd),
+          border: Border.all(color: food.selected ? _kPrimary.withAlpha(30) : AppColors.border),
         ),
         child: Padding(
           padding: const EdgeInsets.fromLTRB(12, 10, 6, 10),
@@ -454,10 +454,10 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
                 width: 22, height: 22,
                 decoration: BoxDecoration(
                   shape: BoxShape.circle,
-                  color: food.selected ? _kPrimary : Colors.white,
-                  border: Border.all(color: food.selected ? _kPrimary : const Color(0xFFCCCCCC), width: 2),
+                  color: food.selected ? _kPrimary : AppTheme.surface,
+                  border: Border.all(color: food.selected ? _kPrimary : AppColors.border, width: 2),
                 ),
-                child: food.selected ? const Icon(Icons.check, size: 17, color: Colors.white) : null,
+                child: food.selected ? const Icon(Icons.check, size: 17, color: AppColors.textOnGradient) : null,
               ),
             ),
             const SizedBox(width: 12),
@@ -514,7 +514,7 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
               ]),
             ),
             IconButton(
-              icon: const Icon(Icons.close, size: 19, color: Color(0xFFBBBBBB)),
+              icon: const Icon(Icons.close, size: 19, color: AppColors.textHint),
               padding: EdgeInsets.zero,
               constraints: const BoxConstraints(),
               onPressed: () => ref.read(dietProvider.notifier).removeFood(food.id),
@@ -532,7 +532,7 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
       child: Container(
         padding: const EdgeInsets.all(20),
         decoration: BoxDecoration(
-          gradient: const LinearGradient(colors: [_kPrimary, Color(0xFF8B7CF0)], begin: Alignment.topLeft, end: Alignment.bottomRight),
+          gradient: AppColors.primaryGradient,
           borderRadius: BorderRadius.circular(16),
           boxShadow: [BoxShadow(color: _kPrimary.withAlpha(40), blurRadius: 10, offset: const Offset(0, 4))],
         ),
@@ -548,12 +548,12 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
                     value: (totalCalories / 700).clamp(0.0, 1.0),
                     strokeWidth: 4,
                     backgroundColor: Colors.white24,
-                    color: Colors.white,
+                    color: AppColors.textOnGradient,
                   ),
                 ),
                 Column(mainAxisSize: MainAxisSize.min, children: [
-                  Text('$totalCalories', style: const TextStyle(fontSize: 17, fontWeight: FontWeight.w800, color: Colors.white)),
-                  Text('kcal', style: const TextStyle(fontSize: 13, color: Colors.white70)),
+                  Text('$totalCalories', style: const TextStyle(fontSize: 17, fontWeight: FontWeight.w800, color: AppColors.textOnGradient)),
+                  Text('kcal', style: const TextStyle(fontSize: 13, color: AppColors.textOnGradient)),
                 ]),
               ],
             ),
@@ -561,14 +561,14 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
           const SizedBox(width: 16),
           Expanded(
             child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
-              const Text('本餐热量', style: TextStyle(fontSize: 17, color: Colors.white70)),
+              const Text('本餐热量', style: TextStyle(fontSize: 17, color: AppColors.textOnGradient)),
               const SizedBox(height: 4),
               Row(children: [
-                Expanded(child: _macroBar('碳水', 0.55, const Color(0xFFFFF9C4))),
+                Expanded(child: _macroBar('碳水', 0.55, AppColors.warningLight)),
                 const SizedBox(width: 8),
-                Expanded(child: _macroBar('蛋白', 0.25, const Color(0xFFD4C8FC))),
+                Expanded(child: _macroBar('蛋白', 0.25, AppColors.iconBg)),
                 const SizedBox(width: 8),
-                Expanded(child: _macroBar('脂肪', 0.20, const Color(0xFFFFCDD2))),
+                Expanded(child: _macroBar('脂肪', 0.20, AppColors.errorLight)),
               ]),
             ]),
           ),
@@ -582,7 +582,7 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
       Row(children: [
         Container(width: 6, height: 6, decoration: BoxDecoration(color: color, shape: BoxShape.circle)),
         const SizedBox(width: 4),
-        Text(label, style: const TextStyle(fontSize: 13, color: Colors.white70)),
+        Text(label, style: const TextStyle(fontSize: 13, color: AppColors.textOnGradient)),
       ]),
       const SizedBox(height: 3),
       ClipRRect(
@@ -597,19 +597,22 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
     return Padding(
       padding: const EdgeInsets.symmetric(horizontal: 16),
       child: Container(
-        padding: const EdgeInsets.all(14),
+        padding: const EdgeInsets.all(16),
         decoration: BoxDecoration(
-          color: _kSurface,
-          borderRadius: BorderRadius.circular(14),
-          border: Border.all(color: _kBorder),
+          gradient: AppColors.gLightPurple,
+          borderRadius: BorderRadius.circular(16),
+          boxShadow: [BoxShadow(color: AppTheme.primary.withAlpha(20), blurRadius: 12, offset: const Offset(0, 4))],
         ),
         child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
           Container(
-            width: 32, height: 32,
-            decoration: BoxDecoration(color: _kPrimaryLight, borderRadius: BorderRadius.circular(8)),
-            child: const Icon(Icons.auto_awesome, size: 19, color: _kPrimary),
+            width: 36, height: 36,
+            decoration: BoxDecoration(
+              gradient: AppColors.primaryGradient,
+              borderRadius: const BorderRadius.all(Radius.circular(10)),
+            ),
+            child: const Icon(Icons.auto_awesome, size: 20, color: AppColors.textOnGradient),
           ),
-          const SizedBox(width: 10),
+          const SizedBox(width: 12),
           Expanded(child: Text(text, style: const TextStyle(fontSize: 16, color: _kText, height: 1.6))),
         ]),
       ),
@@ -617,47 +620,34 @@ class _DietCapturePageState extends ConsumerState<DietCapturePage> {
   }
 
   // ─────────── 保存按钮 ───────────
-  Widget _buildSubmitButton(BuildContext context, WidgetRef ref) {
-    return Padding(
-      padding: const EdgeInsets.symmetric(horizontal: 16),
-      child: SizedBox(
-        width: double.infinity,
-        height: 50,
-        child: ElevatedButton(
-          onPressed: () async {
-            try {
-              await ref.read(dietProvider.notifier).saveRecord();
-              if (context.mounted) {
-                ScaffoldMessenger.of(context).showSnackBar(SnackBar(
-                  content: const Text('饮食记录已保存'),
-                  backgroundColor: _kPrimary,
-                  behavior: SnackBarBehavior.floating,
-                  duration: const Duration(seconds: 2),
-                ));
-                popRoute(ref);
-              }
-            } catch (e) {
-              if (context.mounted) {
-                ScaffoldMessenger.of(context).showSnackBar(SnackBar(
-                  content: Text('保存失败: $e'),
-                  backgroundColor: AppTheme.error,
-                  behavior: SnackBarBehavior.floating,
-                ));
-              }
-            }
-          },
-          style: ElevatedButton.styleFrom(
-            backgroundColor: _kPrimary,
-            foregroundColor: Colors.white,
-            elevation: 0,
-            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(AppTheme.rMd)),
-            textStyle: const TextStyle(fontSize: 19, fontWeight: FontWeight.w600),
+  Widget _buildSubmitButton() {
+    return SizedBox(
+      width: double.infinity,
+      height: 52,
+      child: Container(
+        decoration: BoxDecoration(
+          gradient: AppColors.gPurplePink,
+          borderRadius: BorderRadius.circular(14),
+          boxShadow: [BoxShadow(color: AppColors.primary.withAlpha(20), blurRadius: 12, offset: const Offset(0, 4))],
+        ),
+        padding: const EdgeInsets.all(1.5),
+        child: Material(
+          color: AppTheme.surface,
+          borderRadius: BorderRadius.circular(12.5),
+          child: InkWell(
+            onTap: () async {
+              try {
+                await ref.read(dietProvider.notifier).saveRecord();
+                if (mounted) popRoute(ref);
+              } catch (e) { debugPrint('[Diet] 保存记录失败: $e'); }
+            },
+            borderRadius: BorderRadius.circular(12),
+            child: const Row(mainAxisAlignment: MainAxisAlignment.center, children: [
+              Icon(Icons.check_circle_outline, size: 22, color: AppColors.primary),
+              SizedBox(width: 8),
+              Text('保存记录', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: AppColors.primary)),
+            ]),
           ),
-          child: const Row(mainAxisAlignment: MainAxisAlignment.center, children: [
-            Icon(Icons.check_circle_outline, size: 23),
-            SizedBox(width: 8),
-            Text('保存记录'),
-          ]),
         ),
       ),
     );